AI Factory is the developer of many board game implementations for Android, including Chess, Go, etc.
I've had Chess Free installed on my devices since two years for casual play from time to time and i've seen many updates. It uses Microsoft's Treebeard engine, therefore it doesn't play at the highest levels at all. I would not expect more than 1800 ELO according to a few manual games i've conducted various UCI engines.
You may give a try on this nice looking app if you don't especially need something very professional. What i like in Chess Free AI is the Fischer clock feature which is usually ignored in many standalone apps. What i hate most is the kiddy strength settings like easy, medium, hard. Chess AI doesn't come with these at least.
GET Chess Free AI at GooglePlay.
In case you don't want ads, you may purchase the paid version HERE. It's cheap enough.